复垦重构土壤有机质的空间变异特性研究

Study on Time-space Variation of Organic Substance Content in Reconstructed Soil

采用网格取样法对三块不同时间的铲运机复垦重构土壤以及一块普通农田进行了取样化验,求得有机质值,应用地质统计学理论和克立格法,研究了铲运机复垦重构土壤有机质的空间变异性。结果表明:三块实验田均为对数正态分布。实验田3在0°和135°方向的土壤有机质的半变差函数模型为纯块金效应模型,在其它方向和另外二块实验田的半变差函数模型均为球状模型。用克立格估值作出了三块实验田有机质含量的分布等值线图,为评价复垦后土壤质量状况提供了直接依据。

In the paper organic substance content in soil was studied with girding sampling in three reclaimed plots with different reclaiming time and a normal farmland plot. The time-space variation of organic substance content in soil was studied by geostatistics and Kriging method. The results show that organic substance content in soil is logarithm normal distribution in the three plots. The half-variation model of organic substance content in soil in plot 3 in direction 0° and 135° is the pure nugget model, in the other direction and in the rest two plots is spherical model. Isoline diagrams of organic substance content in soil of the three plots were made on the basis of Kriging value, which provide direct basis for evaluation of the reclaimed soil quality.